Increasing (or decreasing) the memory available to R processes

r memory-management memory-leaks
medriscoll picture medriscoll · Sep 8, 2009 · Viewed 217.7k times · Source

I would like to increase (or decrease) the amount of memory available to R. What are the methods for achieving this?

Answer

BobbyShaftoe picture BobbyShaftoe · Sep 8, 2009

From:

http://gking.harvard.edu/zelig/docs/How_do_I2.html (mirror)

Windows users may get the error that R has run out of memory.

If you have R already installed and subsequently install more RAM, you may have to reinstall R in order to take advantage of the additional capacity.

You may also set the amount of available memory manually. Close R, then right-click on your R program icon (the icon on your desktop or in your programs directory). Select ``Properties'', and then select the ``Shortcut'' tab. Look for the ``Target'' field and after the closing quotes around the location of the R executible, add

--max-mem-size=500M

as shown in the figure below. You may increase this value up to 2GB or the maximum amount of physical RAM you have installed.

If you get the error that R cannot allocate a vector of length x, close out of R and add the following line to the ``Target'' field:

--max-vsize=500M

or as appropriate. You can always check to see how much memory R has available by typing at the R prompt 

memory.limit()

which gives you the amount of available memory in MB. In previous versions of R you needed to use: round(memory.limit()/2^20, 2).

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